What exactly is deep work?

Deep work is undistracted, mindful and intensional work that yields an efficient and accurate result. I love deep work because it feels like time is flying by as I get a lot of work done.

I consider a deep work session a time of concentration and effort doing the task at hand. It should be a time with no distractions and a certain rigour is applied to the work so to achieve a satisfying production and ultimately a desired result.